Sura 4
Verse 82
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أَفَلَا يَتَدَبَّرُونَ ٱلْقُرْءَانَ وَلَوْ كَانَ مِنْ عِندِ غَيْرِ ٱللَّهِ لَوَجَدُوا۟ فِيهِ ٱخْتِلَـٰفًا كَثِيرًا
Why do they not study the Quran carefully? If it were from other than God, they surely would have found in it many contradictions.